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La expansión térmica, las propiedades ferroeléctricas y magnéticas en (1 - x) PbTiO(3) -xBi(Ni(1/2) Ti(1/2)) O(3)
Penghao Hu1, Jun Chen, Jinxia Deng
1Department of Physical Chemistry, State Key Laboratory for Advanced Metals and Materials, University of Science and Technology Beijing, Beijing 100083, China.
Journal of the American Chemical Society
|January 26, 2010
Resumen
Los investigadores desarrollaron un nuevo compuesto multiferroico con expansión térmica cercana a cero mediante la modificación química del titanato de plomo. Este material exhibe piezoelectricidad mejorada, ferroelectricidad y propiedades mecánicas, por lo que es adecuado para aplicaciones de alto rendimiento.
Área de la Ciencia:
- Ciencia de los materiales Ciencia de los materiales.
- Química del estado sólido.
- Materiales multiferroicos Los materiales multiferroicos son los materiales
Sus antecedentes:
- Los materiales a base de titanato de plomo (PbTiO3) son ampliamente estudiados por sus propiedades piezoeléctricas y ferroeléctricas.
- El desarrollo de materiales con expansión térmica sintonizable y características multiferroicas es crucial para aplicaciones avanzadas.
Objetivo del estudio:
- Para sintetizar y caracterizar un nuevo compuesto multiferroico con expansión térmica cercana a cero.
- Investigar las propiedades estructurales, eléctricas, magnéticas y mecánicas de las soluciones sólidas de (1 - x) PbTiO3-xBi(Ni((1/2) Ti(1/2)) O3.
Principales métodos:
- Ruta de modificación química para la síntesis de materiales.
- Difracción de rayos X para el análisis estructural.
- Mediciones del coeficiente de expansión térmica.
- Evaluaciones de propiedades ferroeléctricas, piezoeléctricas y magnéticas.
Principales resultados:
- Se desarrolló con éxito una solución sólida de (1 - x) PbTiO3-xBi(Ni(1/2) Ti(1/2)) O3.
- La tetragonalidad disminuyó, lo que llevó a una expansión térmica cercana a cero (de -8.81 x 10^-6/°C a 8.46 x 10^-6/°C).
- Se observó un ferromagnetismo débil, junto con piezoelectricidad y ferroelectricidad retenidas.
- Se lograron excelentes propiedades mecánicas, incluyendo alta densidad y resistencia a la fractura.
Conclusiones:
- Las cerámicas desarrolladas (1 - x) PbTiO3-xBi(Ni(1/2) Ti(1/2)) O3 exhiben una prometedora combinación de comportamiento multiferroico, expansión térmica cercana a cero y un rendimiento mecánico superior.
- Estos materiales son adecuados para aplicaciones piezocerámicas de alto rendimiento que requieren estabilidad térmica.
- El estudio presenta una estrategia viable para el diseño de compuestos multiferroicos avanzados.
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